Continuous process for the manufacture of caustic soda or caustic potash



Fatenteol Dec. 20,- llQZZ.

entree STAT-ES imam PATENT @FFHQE.

CAMILLE DJEG'UIDE, 0F ENGHIEN, FRANCE.

CONTINUOUS PROCESS FOR THE MANUQACTURE 0F CAUSTIC SODA OR CAUSTICPOTASH.

No Drawing.

To all whom it may concern:

Be it known that l, CAMILLE DEGUIDE, a subject of theKing of Belgium,and a resident of Enghien, Seine et Oise, France, have invented new anduseful Improvements in a Continuous Process for the Manufacture ofCaustic Soda or Caustic Potash,of which the following is aspecification.

This invention relates to the manufacture of caustic soda or causticpotash.

In my pending application for patent lodged herewith No. 524,695 forProcess for the manufacture of alkali-metal silicates, there isdescribed a manner of operation which consists in decomposing a silicateof barium by water and an alkali-metal sul is to say a tribaryticsilicate, and/or a siliphate.

I have found that by employing the reagents in suitable proportions, itis possible to utilize this same reaction for the production of causticalkali, starting from bibarytic or tribarytic silicate or anintermediate silicate. a

The silicate of barium, in a very finely divided state, is placed insuspension in water containingin solution the, alkali-metal sulphate,and the temperature is raised to about 80 C. One of the followingreactions takes place:

Similar reactions take place for the forma- Application filed December24:, 1921. Serial No. 524,696.

presence of carbon, at' a temperature of about 1400 C. in a rotar ortunnel furnace, the mixture of barium silicate and sulphate obtained bythe reaction which yields the caustic alkali In this way a completecycle of operations is produced.

In the following claims the expression a barium polybasic silicate isused to include a bibarytic silicate, and/or a barium silicate morebasic than the bibarytic silicatethat metal sulphate.

- 2. A process for the production of caustic soda or caustic potash,consisting in dec0mposing a barium poly-basic silicate by water and analkali-metal sulphate, and regenerating silicate by calcining, inpresence of carbon, the miXtureofmono-barytic silicate and sulphateobtained by the reaction which yields the caustic alkali.

In testimony whereof l have signed my name to this specification.

GAMILLE DEGUIDE. Witnesses:

J. ARMENGAUD, W. DEFI JVRIMONI.

